Unlikely Allies

 is a quest in Tyranny, starting the Stone Sea rebel quest line. It is activated by choosing to recruit the Earthshakers for the rebel alliance (if you recruited the Forge-Bound) or the Stonestalker Tribe (if you recruited the Bronze Brotherhood).

Synopsis
Your cause requires powerful allies. The Earthshakers of the Stone Sea and the Stonestalkers would be just the right fit.

Walkthrough

 * How the quest unfolds depends on which faction you recruited as the first part of your alliance (at Lethian's Crossing).
 * If you chose Welby and the Bronze Brotherhood, you'll be sent to Stone Down Gorge to meet Hundred-Blood and her tribe.
 * Zdenya and the Forge-Bound will instead suggest the Earthshakers and send you to Halfgate/Plainsgate to meet Isadora and start negotiations.
 * Travel to the locations, wiping out the Scarlet Chorus where present. Talk to the representatives of each faction. Forging The Way (Earthshakers) or Purge the Stone Sea (Stonestalkers) starts as you jump through several hoops to secure their allegiance.